TONIGHT'S MIGHT-SEE

"Bones," 7 p.m., Fox. This likable show returns to new episodes, with six of them ready. "House," alas, only has four left, starting April 28. Tonight, a young couple goes skinny-dipping, only to find a body in the water. Brennan and Booth probe the murder and face a bigger problem: Their therapist (former "Freaks and Geeks" star John Francis Daly) demands they go on a double date.

"New Amsterdam," 8 p.m., Fox. The trial run concludes tonight, with John and his police partner, Eva, probing a young woman's drowning death. That sends John, who is immortal, flashing back to his days in the 1920s. He was a con man then and stole a lover's diamond bracelet. Meanwhile, he starts to pull away from Sara.

OF NOTE

"High School Confidential," 7 p.m., WE. This terrific documentary series gives us four years in the lives of Kansas teens. Tonight, we meet Caitlin, a devout Catholic who signs a sexual purity card, and Sara N., whose parents want her to marry a Muslim guy. They both prove to be likable, human and changeable.

"Big Bang Theory," 7 p.m., CBS. Sheldon feels threatened by a new co-worker.

"American Experience: Walt Whitman," 9 p.m., PBS. Walt Whitman grew up in a working-class family that crumbled from despair and disease. Self-educated, he brought a fresh force to poetry. It was, he said, a reflection of the America he saw, "turbulent, fleshy, sensual, eating, drinking and breeding." This film — more a literary essay than a biography — views his impact.

"Rules of Engagement," 8:30 p.m., CBS. In the first of six new episodes, the mismatched couples go on vacation. First, they face a sales pitch

"Medium," 9 p.m., NBC. Kelly Preston begins a multiweek run as a venture capitalist who likes Joe's idea — and maybe likes Joe.